Method and equipment for loosening and/or winning minerals especially coal and aggregated materials by using compressed air breaking
US5116104A · kind A · utility
2Cited by
4References
14Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Aug 6, 1990 |
| Grant date | May 26, 1992 |
| Priority date | — |
| Expiry date | Aug 6, 2010 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21C37/14
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method for breaking coal and other mineral matter from a bed thereof provided with a bore hole consists of the steps of applying a flushing medium to a drill bit, loosening the mineral matter upon completing the drilling by conveying the compressed air to a plurality of blow slots and sealing a mouth of the bore before loosening the mineral matter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.